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Oxygen consumption rates in deep-sea hydrothermal vent scale worms: Effect of life-style, oxygen concentration, and temperature sensitivity
Deep Sea Research Part I: Oceanographic Research Papers ( IF 2.4 ) Pub Date : 2021-04-02 , DOI: 10.1016/j.dsr.2021.103531
Victor Le Layec , Stéphane Hourdez

Deep-sea hydrothermal vents are a challenging environment inhabited by very specialized species. To reap the benefits of the local primary production, species need to cope with a number of constraints among which low oxygen is probably the most basic. This hypoxia is further complicated by the highly variable temperature these species experience. We studied the response of deep-sea hydrothermal species of scale worms (Annelida, Polynoidae) to varying levels of oxygen and showed that they were capable of compensating a decrease of environmental oxygen concentration (= oxyregulators), down to values of about 30 μmol l−1. This contrasts with shallow-water temperate species, for which oxygen consumption is directly proportional to its concentration (= oxyconformers). We measured oxygen consumption rates in 11 species from hydrothermal vents, as well as 2 species from the general deep-sea, and compared them to three shallow-water species. Life-style (free-living vs. commensal) and habitat of origin (shallow-water, deep-sea, and hydrothermal vent) did not affect oxygen consumption rates. In agreement with thermodynamic expectations, as temperature increases, oxygen consumption increases as well for all species. The sensitivity of oxygen consumption to temperature variation in the shallow-water species is however smaller than that from the deep-sea hydrothermal vent species. This unexpected result could correspond to a pronounced increase of activity (avoidance behaviour) in the vent species, which was not observed for the shallow-water species.



中文翻译:

深海热液喷口蠕虫的耗氧率:生活方式,氧气浓度和温度敏感性的影响

深海热液喷口是非常专业的物种所居住的充满挑战的环境。为了从当地初级生产中获得收益,物种需要应对许多制约因素,其中低氧可能是最基本的。这些物种经历的高度可变的温度进一步使这种缺氧更加复杂。我们研究了鳞翅目蠕虫(Annelida,Polynoidae)的深海热液物种对不同水平的氧气的响应,并表明它们能够补偿环境氧气浓度(=调节剂)的降低,降低至大约30μmoll的值。-1。这与浅水温带物种形成对比,后者的耗氧量与其浓度成正比(=氧化型构象异构体)。我们测量了来自热液喷口的11种物种以及普通深海的2种物种的耗氧率,并将它们与三种浅水物种进行了比较。生活方式(自由生活与普通生活)和起源地(浅水,深海和热液喷口)均不影响耗氧率。与热力学预期一致,随着温度的升高,所有物种的氧气消耗也随之增加。然而,浅水物种的耗氧量对温度变化的敏感性要小于深海热液排放物种的耗氧量。

更新日期:2021-04-02
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